Hanging Connection

[MichaHoffmann]

The connection deadline is only set after smtpNewClient was called. Since smtpNewClient already wants to read 220 from the connection, a server that does not respond will result in a hanging connection.

This issue should be resolvable by moving the deadline code just after creation of the connection.

func (d *Dialer) Dial() (SendCloser, error) {
	conn, err := NetDialTimeout("tcp", addr(d.Host, d.Port), d.Timeout)
	if err != nil {
		return nil, err
	}

	if d.SSL {
		conn = tlsClient(conn, d.tlsConfig())
	}

	c, err := smtpNewClient(conn, d.Host)
	if err != nil {
		return nil, err
	}

	if d.Timeout > 0 {
		conn.SetDeadline(time.Now().Add(d.Timeout))
	}

[afk11]

Duplicate of #49